/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.internal.xjc.reader.dtd;

import java.util.List;

/**
 * @author Kohsuke Kawaguchi
 */
abstract class Term {
    abstract void normalize( List<Block> r, boolean optional );

    abstract void addAllElements(Block b);

    abstract boolean isOptional();

    abstract boolean isRepeated();

    /**
     * Represents empty term.
     * <p>
     * This special term is only used to represent #PCDATA-only content model.
     */
    static final Term EMPTY = new Term() {
        void normalize(List<Block> r, boolean optional) {
        }

        void addAllElements(Block b) {
        }

        boolean isOptional() {
            return false;
        }

        boolean isRepeated() {
            return false;
        }
    };
}
